File Browser: Command Injection via Authentication Hook Shell Substitution (Pre-Authentication RCE)
File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.63.6, the Hook Authentication feature in File Browser allows administrators to delegate login verification to an external shell command. User-supplied credentials (username and password) are interpolated into this command string using os.Expand without sanitization. An unauthenticated remote attacker can inject shell metacharacters in the username or password field at the login screen, causing the server to execute arbitrary OS commands before any authentication takes place. This is a critical pre-authentication RCE. This vulnerability is fixed in 2.63.6.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-54088
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 12:54 UTC · Revision 1
Source evidence
File Browser: Command Injection via Authentication Hook Shell Substitution (Pre-Authentication RCE)
core-osv · Original sourcePublished 25 Jun 2026, 17:49 UTC
File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.63.6, the Hook Authentication feature in File Browser allows administrators to delegate login verification to an external shell command. User-supplied credentials (username and password) are interpolated into this command string using os.Expand without sanitization. An unauthenticated remote attacker can inject shell metacharacters in the username or password field at the login screen, causing the server to execute arbitrary OS commands before any authentication takes place. This is a critical pre-authentication RCE. This vulnerability is fixed in 2.63.6.
osv:CVE-2026-54088
Complete source record
{
"id": "fc853b7e6babccee3f3fb150fd062a5ca16b06e2436929ce14cd535fcdde6d51",
"url": "https://osv.dev/vulnerability/CVE-2026-54088",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "File Browser: Command Injection via Authentication Hook Shell Substitution (Pre-Authentication RCE)",
"summary": "File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.63.6, the Hook Authentication feature in File Browser allows administrators to delegate login verification to an external shell command. User-supplied credentials (username and password) are interpolated into this command string using os.Expand without sanitization. An unauthenticated remote attacker can inject shell metacharacters in the username or password field at the login screen, causing the server to execute arbitrary OS commands before any authentication takes place. This is a critical pre-authentication RCE. This vulnerability is fixed in 2.63.6.",
"evidence": "osv:CVE-2026-54088",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2026-54088",
"aliases": [
"CVE-2026-54088",
"GHSA-m93h-4hw7-5qcm",
"GO-2026-5962"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/filebrowser/filebrowser",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "85b7d2762dda67b6158220991654c65b43739005"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "2.63.6"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"introduced": "0"
},
{
"fixed": "2.63.6"
}
],
"source": "DESCRIPTION"
}
]
}
}
],
"versions": [
"v2.63.5",
"v2.63.4",
"v2.63.3",
"v2.63.1",
"v2.63.0",
"v2.62.2",
"v2.62.1",
"v2.62.0",
"v2.61.2",
"v2.61.1",
"v2.61.0",
"v2.60.0",
"v2.59.0",
"v2.58.0",
"v2.57.1",
"v2.57.0",
"v2.56.0",
"v2.55.0",
"v2.54.0",
"v2.53.1",
"v2.53.0",
"v2.52.0",
"v2.51.2",
"v2.51.1",
"v2.51.0",
"v2.50.0",
"v2.49.0",
"v2.48.2",
"v2.48.1",
"v2.48.0",
"v2.47.0",
"v2.46.1",
"v2.46.0",
"v2.45.3",
"v2.45.2",
"v2.45.1",
"v2.45.0",
"v2.44.2",
"v2.44.1",
"v2.44.0",
"v2.43.0",
"v2.42.5",
"v2.42.4",
"v2.42.3",
"v2.42.2",
"v2.42.1",
"v2.42.0",
"v2.41.0",
"v2.40.2",
"v2.40.1",
"v2.40.0",
"v2.39.0",
"v2.38.0",
"v2.37.0",
"v2.36.3",
"v2.36.2",
"v2.36.1",
"v2.36.0",
"v2.35.0",
"v2.34.2",
"v2.34.1",
"v2.34.0",
"v2.33.10",
"v2.33.9",
"v2.33.8",
"v2.33.7",
"v2.33.6",
"v2.33.5",
"v2.33.4",
"v2.33.3",
"v2.33.2",
"v2.33.1",
"v2.33.0",
"v2.32.3",
"v2.32.2",
"v2.32.1",
"v2.32.0",
"v2.31.2",
"v2.31.1",
"v2.31.0",
"v2.30.0",
"v2.29.0",
"v2.28.0",
"v2.27.0",
"v2.26.0",
"v2.25.0",
"v2.24.2",
"v2.24.1",
"v2.24.0",
"v2.23.0",
"v2.22.4",
"v2.22.3",
"v2.22.2",
"v2.22.1",
"v2.22.0",
"v2.21.1",
"v2.21.0",
"v2.20.1",
"v2.20.0",
"v2.19.0",
"v2.18.0",
"v2.17.2",
"v2.17.1",
"v2.17.0",
"v2.16.1",
"v2.16.0",
"v2.15.0",
"v2.14.1",
"v2.14.0",
"v2.13.0",
"v2.12.1",
"v2.12.0",
"v2.11.0",
"v2.10.0",
"v2.9.0",
"v2.8.0",
"v2.7.0",
"v2.6.2",
"v2.6.1",
"v2.6.0",
"v2.5.0",
"v2.4.0",
"v2.3.0",
"v2.2.0",
"v2.1.2",
"v2.1.1",
"v2.1.0",
"v2.0.16",
"v2.0.15",
"v2.0.14",
"v2.0.13",
"v2.0.12",
"v2.0.11",
"v2.0.10",
"v2.0.9",
"v2.0.8",
"v2.0.7",
"v2.0.6",
"v2.0.5",
"v2.0.4",
"v2.0.3",
"v2.0.2",
"v2.0.1",
"v2.0.0",
"v2.0.0-rc.2",
"v2.0.0-rc.1",
"v1.11.0",
"v1.10.0",
"v1.9.0",
"v1.8.0",
"v1.7.1",
"v1.7.0",
"v1.6.0",
"v1.5.5",
"v1.5.4",
"v1.5.3",
"v1.5.2",
"v1.5.1",
"v1.5.0",
"v1.4.6",
"v1.4.5",
"v1.4.4",
"v1.4.3",
"v1.4.0",
"v1.3.12",
"v1.3.11",
"v1.3.10",
"v1.3.9",
"v1.3.8",
"v1.3.7",
"v1.3.6",
"v1.3.5",
"v1.3.4",
"v1.3.3",
"v1.3.2",
"v1.3.1",
"v1.3.0",
"v1.2.9",
"v1.2.8",
"v1.2.7",
"v1.2.6",
"v1.2.5",
"v1.2.4",
"v1.2.3",
"v1.2.2",
"v1.2.1",
"v1.2.0",
"v1.1.1",
"v1.1.0",
"v1.0.2",
"v1.0.1",
"v1.0.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54088.json"
}
}
],
"modified": "2026-10-28T02:30:50.761962489Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54088.json",
"https://github.com/filebrowser/filebrowser/security/advisories/GHSA-m93h-4hw7-5qcm",
"https://nvd.nist.gov/vuln/detail/CVE-2026-54088"
],
"provider_metadata": {
"cwe_ids": [
"CWE-306",
"CWE-78",
"CWE-88"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54088.json"
}
},
"related_cves": [
{
"value": "CVE-2026-54088",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 519353,
"published_at": "2026-06-25T17:49:14.017+00:00"
}